"Multilevel memory system—The multilevel memory system of each processor is based on the L1 instruction and data caches, L2 cache, and internal and external memory. The processors support many types of external memory devices, including DDR3, low voltage DDR3, LPDDR2, NOR Flash, PSRAM, cellular RAM, NAND Flash (MLC and SLC), OneNAND™, and managed NAND, including eMMC up to rev 4.4/4.41"

Here recommend you to use the eMMC 5.0 8GB. The emmc5.0 or emmc5.1 performance is better than the emmc4.41. Although the hardware only support the emmc4.41. But in our newest BSP, the driver support the emmc5.0 protocol and the performance is better than emmc4.41. So emmc5.0 or emmc5.1 is better choice.Have a great day, Rita